She tapped a command on her tablet. A surge of electrons, harvested from a wind farm three hundred miles offshore, tore through the saltwater inside the tank. In the old days, this would have just made bubbles. But Elena’s electrodes were coated with a "smart" catalyst—a molecular lattice that acted like a microscopic sorting machine.

On the left, pure hydrogen hissed into a pressurized vein, ready to fuel a fleet of transcontinental trucks. On the right, carbon dioxide—captured directly from the local atmosphere—was being forced into a marriage with water.

Elena looked. The sensors confirmed it: they were producing high-density aviation fuel out of thin air and seawater.

Elena walked to the window. Outside, the city lights flickered, powered by the very chemical bonds she was weaving in the dark. The age of fire was ending; the age of the electron had finally arrived.